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The data were fitted to a modified Sulzer-Wieland function

σ = (σ_med/(1 - b/ν) exp{-a [ln ((ν - b)/(ν_med - b))]²}

which yielded
σ_med = 1.64×10^-18 cm² molecule^-1, ν_med = 50260 cm^-1,
a = 4.91, and b = 30612 cm^-1